Maybe you have already read these but here are my favorites :) There are many good manhwas but they are mostly reincarnated/regression so they are OP from the start.
WEAK TO STRONG:
Terrarium Adventure - Underrated. MC is female. Not OP but has OP money. Give it a read. It's funny and different. She isekaid btw.
Arcane Sniper - Very funny story. MC is so hilarious and he started from a skilled sniper in real life but a weak player. Not a reincarnation manhwa. The concept is a logging in a game so it's not happening in the real world.
Transcension Academy - Weak but then MC got OP from learning from Gandhi, Hercules, and other powerful figures. Also, not a reincarnation manhwa so it's nice.
Sleeping Ranker - MC only wanted to sleep but then he got promoted to a descendant of a god. He was suddenly pushed to play when he didn't want to so it's a fun read.
The Novel’s Extra (2022) - MC got pulled in his novel and now has to live in it. He has no clue what's going on but he got so good in the process.
I've read too many leveling mahwas and I'm fine with MCs being OP as it gives us readers excitement to see how powerful they are.
But the MC here is too OP at the very beginning that I'm not sure what to feel about this. 6 chapters and he is aready clearing the tower alone. Well the title is literally the whole plot so far. I just wish they will show some character development soon or it will be boring. :) It's just the start anyway, I guess I have to wait for more updates.